Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1221-1240 of 13215
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Precipitating Quasigeostrophic Equations and Potential Vorticity Inversion with Phase Changes
(American Meteorological Society, 2017)AbstractPrecipitating versions of the quasigeostrophic (QG) equations are derived systematically, starting from the equations of a cloud-resolving model. The presence of phase changes of water from vapor to liquid and vice ... -
A Grid-Refinement-Based Approach for Modeling the Convective Boundary Layer in the Gray Zone: A Pilot Study
(American Meteorological Society, 2017)AbstractThe model gray zone refers to the range of grid spacings comparable to the dominant length scale of the flow. In the gray zone, the flow is partially resolved and partially subgrid scale (SGS). Neither ensemble-a ... -
Small-Scale Wind Fluctuations in the Tropical Tropopause Layer from Aircraft Measurements: Occurrence, Nature, and Impact on Vertical Mixing
(American Meteorological Society, 2017)AbstractThe contribution of turbulent mixing to heat and tracer transport in the tropical tropopause layer (TTL) is poorly constrained, partly owing to a lack of direct observations. Here, the authors use high-resolution ... -
On the Generation and Maintenance of the 2012/13 Sudden Stratospheric Warming
(American Meteorological Society, 2017)AbstractUsing a newly developed analysis tool, multiscale window transform (MWT), and the MWT-based localized multiscale energetics analysis, the 2012/13 sudden stratospheric warming (SSW) is diagnosed for an understanding ... -
A Matérn-Based Multivariate Gaussian Random Process for a Consistent Model of the Horizontal Wind Components and Related Variables
(American Meteorological Society, 2017)AbstractThe integration of physical relationships into stochastic models is of major interest, for example, in data assimilation. Here, a multivariate Gaussian random field formulation is introduced that represents the ... -
On the Quantification of Imbalance and Inertia–Gravity Waves Generated in Numerical Simulations of Moist Baroclinic Waves Using the WRF Model
(American Meteorological Society, 2017)AbstractQuantification of inertia?gravity waves (IGWs) generated by upper-level jet?surface front systems and their parameterization in global models of the atmosphere relies on suitable methods to estimate the strength ... -
The Role of Surface Drag in Mesocyclone Intensification Leading to Tornadogenesis within an Idealized Supercell Simulation
(American Meteorological Society, 2017)AbstractThe idealized supercell simulations in a previous study by Roberts et al. are further analyzed to clarify the physical mechanisms leading to differences in mesocyclone intensification between an experiment with ... -
Regionally Resolved Diagnostic of Transport: A Simplified Forward Model for CO2
(American Meteorological Society, 2017)AbstractSimply diagnostic tools are useful for understanding transport processes in complex chemistry transport models (CTMs). For this purpose, a combined use of the airmass origin fractions (AOFs) and regionally resolved ... -
Formation and Development of Orographic Mixed-Phase Clouds
(American Meteorological Society, 2017)AbstractOrographic forcing can stabilize mixed-phase clouds (MPCs), which are thermodynamically unstable owing to the different saturation vapor pressure over liquid water and ice. This study presents simulations of MPCs ... -
Reconstruction of Thermodynamic Cycles in a High-Resolution Simulation of a Hurricane
(American Meteorological Society, 2017)AbstractThe relationship between energy transport and kinetic energy generation in a hurricane is analyzed. The hydrological cycle has a negative impact on the generation of kinetic energy. First, in a precipitating ... -
Ice Nucleation Parameterization and Relative Humidity Distribution in Idealized Squall-Line Simulations
(American Meteorological Society, 2017)AbstractOutput from idealized simulations of a squall line are compared with in situ aircraft-based observations from the Deep Convective Clouds and Chemistry campaign. Relative humidity distributions around convection are ... -
The Subtropical Stratocumulus-Topped Planetary Boundary Layer: A Climatology and the Lagrangian Evolution
(American Meteorological Society, 2017)AbstractPrior work has shown that deeper planetary boundary layers (PBLs) are associated with cloud breakup and reduced droplet concentration in subtropical stratocumulus cloud decks, motivating a need for a thorough ... -
Model Selection: Using Information Measures from Ordinal Symbolic Analysis to Select Model Subgrid-Scale Parameterizations
(American Meteorological Society, 2017)AbstractThe use of information measures for model selection in geophysical models with subgrid parameterizations is examined. Although the resolved dynamical equations of atmospheric or oceanic global numerical models are ... -
Energy Spectra and Inertia–Gravity Waves in Global Analyses
(American Meteorological Society, 2017)AbstractSeveral decades after E. Dewan predicted that the shallowing of the atmospheric energy spectrum in mesoscale is produced by the inertia?gravity (IG) waves, global analyses have reached the resolution at which the ... -
Roles of Streamwise and Transverse Partial-Vorticity Components in Steady Inviscid Isentropic Supercell-Like Flows
(American Meteorological Society, 2017)AbstractInvestigations of tornadogenesis in supercells attempt to find the origin of the tornado?s large vorticity by determining vorticity generation and amplification along trajectories that enter the tornado from a ... -
A 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains
(American Meteorological Society, 2017)AbstractThe forcing of northerly low-level jets over the eastward-sloped terrain of the U.S. Great Plains was studied using a one-dimensional (1D) nonstationary analytical model based on the Boussinesq-approximated equations ... -
The Regulation of Tornado Intensity by Updraft Width
(American Meteorological Society, 2017)AbstractStrong to violent tornadoes cause a disproportionate amount of damage, in part because the width and length of a tornado damage track are correlated to tornado intensity (as now estimated through enhanced Fujita ... -
Dynamics and Predictability of Downward-Propagating Stratospheric Planetary Waves Observed in March 2007
(American Meteorological Society, 2017)AbstractThe predictability of a downward-propagating event of stratospheric planetary waves observed in early March 2007 is examined by conducting ensemble forecasts using an AGCM. It is determined that the predictable ... -
Tropical Atmospheric Madden–Julian Oscillation: A Strongly Nonlinear Free Solitary Rossby Wave?
(American Meteorological Society, 2017)AbstractThe Madden?Julian oscillation (MJO), a planetary-scale eastward-propagating coherent structure with periods of 30?60 days, is a prominent manifestation of intraseasonal variability in the tropical atmosphere. It ... -
A Physically Based Horizontal Subgrid-Scale Turbulent Mixing Parameterization for the Convective Boundary Layer
(American Meteorological Society, 2017)AbstractCompared to the representation of vertical turbulent mixing through various planetary boundary layer (PBL) schemes, the treatment of horizontal turbulent mixing in the boundary layer has received much less attention. ...